Buildihg-block mold



F. 0. HELLSTROIV.

ulLDlNG BLOCK MLD.

APPLICATION FILED MAY 2.1918.

l ,3 1 2,6 31 Patented Aug. 12, 1919.

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FRANK O. HELLSTROM, 0F BISMARCK, NORTH DAKOTA.

. BUILDING-BLOCK MOLD.

To all whom t may concern.'

Be it known that I, FRANK O. HnLLsTRoM,

\ a citizen of the United States, and resident of Bismarck, county of Burleigh, and State of North Dakota, have invented certain Improvements in Building Block Molds, of which the following is a description, reference being. had to the accompanying drawings, forming a part thereof.

The object of the invention is to provide a building block and mold therefor whereby the inconveniences heretofore experienced in the formation and setting of building blocks,

and particularly those designed for use in.

the construction ofsilos may Vbe'overcome, whereby in the formation of the blocks in tiers or series (a plurality being molded at one time or in one operation) a substantial uniformity of dimensions, shape, weight and density may be attainedV without the employr ment of skilled labor, and whereby in the setting of the blocks, thus formed, a satisfactory fitting, joining and anchoring of the same may be attained. i

.Further objects and advantages of the invention will appear in the course of the following description, it being understood that changes in form, proportions and details Vof construction may be resorted to,

within the scope of the appended claims,

i without departing from the spirit of the inoperative position thereto.-

vention.

. In the drawings:

Figure 1 is aplan' view of a mold showing one embodiment of the invention.

Fig. 2 is a longitudinal sectional view of the same.

Fig. 3 is a transverse sectional view taken in a plane adjacent to the surface of a molded block, showing the same in elevation Y of a division plate in rear with a portion thereof.

Fig. 4 is a view 'in perspective of one of the division plates.

Fig. 5 is a similar view ofone of they pallets Vwith a reinforcing member fitted in Fig. 6 is a view in perspective of one 0f Y the molded blocks.

` The mold embodies side walls 10, a series of division plates 11 0f which the lateral Specification of Letters Patent.

Patented Aug. 12, 1919..

Application led May 2, 1918. Serial No. 232,034.

inner surfaces of the walls, said kdivision plates spanning the interval between the side walls, and a series of pallets 13 which close the spaces between the division plates at their bottom or lower edges and which are constructed, as hereinafter more fully explained, to removably or detachably support reinforcing members 14 which, projecting upwardly from the pallets, in the spaces between the division plates, are in the course of the molding of the blocks, embedded therein and subsequently are removed with the blocks for use as hereinafter explained. Preferably the plates are provided with dependent elements 15 to rest upon a bottom board or wall 16 connecting the side walls at their lower edges and also with upstanding terminal lugs 17 which obviously produce correspondin recesses in the lower edges of the molded b ock such as indicated at 18 in Figs. 2, 3 and 6. The pallet is also provided with sockets 19, preferably consisting of grooves in the outer surfaces of the lugs 17 for the reception of the extremities 20 of the reinforcing element 14. Obviously when the block is molded by pouring the semi-liquid cement into the spaces between the division plates, the outflow from said spaces being prevented by the pallets, the body portions of these reinforcing members become embedded in the blocks, and the detachment of the blocks, after the cement has become set, involves the removal of the reinforcing member therewith, and the detatchment of same from the pallet.

Moreover each `pallet is provided at one side with a lateral projecting ledge 21 bounded at its inner side by a shoulder 22, said ledge being adapted to receive the edge of the division plate at that side of the pallet, said plate bearing against the shoulder 22 whereby asubstantial interlockis formed between the division plateV and the pallet, while at the opposite side the pallet has an abrupt or plane bearing surface 23 which bears against the surface of the division plate at that side, and holds it securely in place on the supporting ledge of the adjoining pallet.

Also the pallet is provided with a longitudinal rib 24 which forms a corresponding.

' the division plates and pallets in theirdescribed relations by means of transverse base bars 26 having terminal shoulders 27, side bars 28 engaged at their lower ends with said shoulders on the base bars, provided above the upper edges of the side walls with kerfs 29, and transverse tie rods 30 engaged with said kerfs and headed as at 3l to bear against the outer surfaces of the side bars as shown clearly in Figs. 1, 2 and 3.

'It is obvious that the division plates may be of any desired form or coniiguratiomsuch as "flat, curved or otherwise, to suit the proposed shape of the blocks to be formed therebetween, curved or bowed plates having been selected for illustration in Figs. 1 and el., while the pallet shown in Fig. 5 is straight.

The terminal division plate forming the end of the mold or series of mold members may be held in place by any suitable means such as cross bars 32, anchored in any convenient manner, and as a further reinforcement for the division plates a longitudinal reach bar 33 may be employed and provided on its under side with spacers Sel in the grooves or intervals between which are fitted the upper edges of said plates.

It will be understood that after the mold has been set up as described, the cement or concrete mixture may be flowed into the spaces between the division plates and suitably tamped, if desired or necessary, in order to secure uniformity of compactness as well as of size and shape of the blocks.

`In the use of the blocks in the building of a silo or other wall the terminals of t-he reinforcing members may be intertwisted or linked with those of adjoining blocks, or otherwise disposed to serve as anchoring means for engagement with such other element-s of the wall as may be employed as means for maintaining the parts in their properrelative positions. It isjalso understood that blocks with the construction described can be employed either in single series or in multiple series with interveni'i'ig spaces to provide rair 'chambers las a protec-I tion of the contents of the structure from frost and the like.

Having described the invention, what is claimed is:

1. A mold Vfor building blocks having side walls, spaced division plates spanning the interval between said walls, and pallets closing, respectively, the `spaces between the division plates, and provided with means for detachably supporting a block reinforcing member.

2. A mold for building blocks having side walls, spaced division plates spanning the interval between said walls, and pallets closing, respectively, the spaces between the division plates, provided with sockets for the reception of the terminals of block reinforcing elements.

3. A mold for building blocks having side walls, spaced division plates spanning the interval between said walls, and pallets closing, respectively, the spaces between the division plates, and provided with terminal grooved projections forming sockets for the reception of the terminals of block reinforcing members.

4. A mold for building blocks having side walls, spaced division plates spanning the interval between said walls, and pallets closing, respectively, the space between the division plates, and provided with sockets, to hold wire, block-reinforcing elements disposed above the pallets between the division plates which have depending terminals iitted removably in said sockets.

5. A mold for building blocks having side walls, spaced division plates spanning the interval between said walls, and pallets closing, respectively, the spaces between the division plates, and provided with longitudinal ribs and terminal lugs, arranged be-l tween the planes of the division plates to form corresponding grooves'and recesses in the molded blocks. l

6. A mold for building blocks having side walls, spaced division plates spanning the interval between said walls, and pallets closing, respectively, the spaces between the division plates, and provided with shouldered ledges for Vrespc'actively engaging the lower edges of the same.

7. A mold for building blocks having side walls, spaced division plates spanning the interval between said walls, and pallets closing, respectively, the spaces between the division plates, and each having vat one side a shouldered ledge for supporting one of said plates and at the other side a` plate abutting surface.

8. A mold for building blocks having side and bottom walls, spaced division plates spanning the interval'between the side walls and itted at their edges in grooves in the side walls, pallets seated upon the bottom walls and closing the spaces between the division plates, transverse base bars having sl'iouldered `extremitiesproject- K ing beyond the side walls, side bars ennected with the upper terminals ofthe side bars and removably iitted in seats therein. 9. A mold for building blocks having side wells, spaced division plates seated at This speoieation signed and witnessed their side edges in said walls, pallets olosthis 12th dey of Nov., 1917. ing the bottoms of the spaces between said division plates and having seats for the FRANK O HELLSTROM' lower edges thereof, and a, longitudinal Witnesses:

reach bar having means for spacing and H. S. LoBAoH,

seating the upper edges of the plates. J. R. MUsoLF.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, IJ. C. 

